Classification
500 - Natural sciences & mathematics
700 - The arts; fine & decorative arts
34
333 - Economics of land & energy
28
000 - Computer science, information & general works
26
610 - Medicine & health
26
620 - Engineering & allied operations
24
576 - Genetics & evolution
23
600 - Technology
20
612 - Human physiology
19
380 - Commerce, communications & transportation
17
363 - Other social problems & services
14
580 - Plants (Botany)
13
140 - Specific philosophical schools
12
900 - History & geography
10
340 - Law
8
540 - Chemistry & allied sciences
8
004 - Data processing & computer science
7
581 - Specific topics in natural history
7
330 - Economics
6
414 - Phonology & phonetics
6
530 - Physics
6
621 - Applied physics
6
304 - Factors affecting social behavior
4
384 - Communications; telecommunication
4
615 - Pharmacology & therapeutics
4
720 - Architecture
4
300 - Social sciences
3
320 - Political science
3
551 - Geology, hydrology & meteorology
3
364 - Criminology
2
370 - Education
2
520 - Astronomy & allied sciences
2
572 - Biochemistry
2
658 - General management
2
100 - Philosophy & psychology
1
302 - Social interaction
1
331 - Labor economics
1
400 - Language
1
410 - Linguistics
1
571 - Physiology & related subjects
1
630 - Agriculture & related technologies
1
745 - Decorative arts
1
800 - Literature & rhetoric
1
808 - Rhetoric & collections of literature
1